Calipers



- 1,595,733 J. J. ROGACH CALI PERS Aug. 10 1926.

Filed Feb. 6, 1926 JOSEPH J. Roan cH INVENTOR w BY ATTORNEY fro Patented Aug. 10, 1926.

My invention rel a p articular JOSEPH J. ROGACH, OF BROOKLYN, NEW YORK.

CALIPERS.

Application filed February 6, 1926. Serial No. 86,522..

ates to calipers and has reference to calipers provided with an attachment for measuring distances or openings between the caliper legs.

The object of my invention calipers of any ordinary type, iernal or external calipers, compasses, d1-

viders, etc.,

by the adjusting screw attachment being in the form eating wheel with divi dicate the correct distances My attachment, of course,

ch types of calipers as are sting scr e fully described in per legs.

used only with su provided with an adju My invention is m'or the accompanying specification mg in wh1ch- Fig. 1 is a genera Fig. 2 is a side view partly in on an enlarged sca tachment, and Fig.

partly in section.

My calipers compri with their rear ends on a pi fiat heads lon both sides. side of the pivot the l notches 5 for the end of a circular 6 which tends to open or spread apart legs of the calipers.

The leg 1 has a pin the end of an ad The screw is passing through 9 in a block or post 10 of the post 10 slideg 2 and is reon the leg 2. ably fits in a The post is a small gear wheel of the screw 8. The gear a shaft 1 1 journaled in post 10.

between legs 1 and 2.

have numerals O. 1,

graved on the in actual practic rent to make the the of the caliper hole 11 in the l tained with a head 12 which may by riveting the end of the eting the post mus to permit its rotati which The end provided with a 13 engaging 13 1s indicate GgS are pl is to provide such as inof an indisions calibrated to inbetween the calican be and draw- 1 view of my calipers,

section and 1e of my indicating at 3 is an end View of same se legs 1 and 2 resting vot 3 with large On the rear ovided with flat spring the 7 on the side on which 1ust1ng screw 8 1s pivoted.

an aperture 1s mounted be formed post. After rivt be loosened sufficiently on in the hole 11.

slot 12 for the threads fastened on the sides of the tached to the This wheel is so that distances in adapted distances between the Accordingly the marks 16 wheel 15.

legs to the screw 2 etc. stamped or en three times the distance between the screw and the pivot 3, so that distances along the screw are four times smaller than distances between the leg points. The screw 8 may be made with 32 threads per inch, each thread corresponding to 1/8 of an inch between the leg points.

The gear 13 is made of a small diameter so to provide large angular rotation for each movement of the legs 1 and 2. The wheel is substantially larger than the wheel 13, so that each large division 1, 2, 3 etc., corresponding to 1/8 between the legs 1 and 2, can be further subdivided into 8 parts, each corresponding to 1/64 between the legs, which is quite suflicient for ordinary measurements, as for more accurate measurements micrometers are used.

The adjusting nut 17 may be of any ordinary construction.

For indicating large distances, for instance, inches, I provide divisions 18 on the head l of the pivot 3. A special indicating or starting mark 18 is placed on the leg 1 for counting the number of divisions 18, or number of full inches of opening of the calipers. A convenient arrangement may be obtained by making the wheel 13 with 8 teeth so that its one complete turn corresponds to one inch opening and one full division 18. By making 8 divisions on the wheel 15, each division will correspond to 1/8 between the legs.

Of course, the divisions may be made in any convenient system of measurement, for instance, in metric system.

The circular head 1 or the pivot 3 may be attached to the leg 2.

Important advantages of my attachment to calipers are, that this attachment can be used. with any ordinary calipers or comasses which use adjusting screw, and that with this attachment it is not necessary to use measuring rule every time when the calipers are used for measuring distance between the caliper legs.

This attachment is also very compact and does not render the calipers larger than their ordinary size, also that the readings are convenient and accurate within practical limits.

I claim as my invention:

1. In calipers, the combination with an adjusting screw adapted to control distances between the legs of said calipers, a gear wheel adapted to be operated by said screw.

post rotatively mounted on the other leg of said calipers and provided with an aperture for said screw, an adjusting nut'on said screw, a shaft for said gear wheel, an

indicating wheel, said gear wheel" and said indicating wheel being attached to said- 7 shaft, said post being provided with a slot for said gear-wheel, said shaft being journaled in the-sides of said slot.

2. In calipers, the combination with an adjusting screw adapted to control distances between the legs of said calipers, a gear wheelin an engagement with said screw, an indicating wheel for said gear wheel, a common shaft for said gear wheel and said indicating wheel, a post rotatively mounted on one leg of said calipers and provided with an aperture for said screw, said post being adapted to support said wheels and said shaft, the location of said post on the leg: of said calipers, the pitch of said screw and the diameter ot'said gear wheel being. so proportioned that one revolution of said indicating wheel correr sponds' to. one unit of length between the legs of said calipers.

Signed at'Brooklyn in the county of Kings and State of New York.

JOSEPH J. ROGACH. 

